Abstract
This code includes the data preparation and curation for my PhD research on “The role of depressive symptoms and cardiometabolic risk factors in the prediction of dementia: a cross-country comparison in England, the United States and China”. The scripts are written in SPSS version 27 and include the code and procedures for data preparation, curation and harmonisation across three publicly available population-based databases: the English Longitudinal Study of Ageing (ELSA), Health and Retirement Study (HRS), China Health and Retirement Longitudinal Study (CHARLS).